Magnetic-Field Interactions in a Rotating Molecule

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Abstract
Rotational—magnetic‐field interactions of a molecule with zero electronic spin and zero orbital angular momentum are treated. The external magnetic field gives rise to interactions involving the molecular‐magnetic‐moment tensor (molecular g tensor), the magnetic‐susceptibility tensor, and the nuclear magnetic‐shielding tensor. The tensors are described in the principal inertial‐axis system. Two types of molecules are considered. In the first case only external magnetic‐field‐induced nuclear‐rotational couplings are present. In the second case a strong nuclear‐quadrupole and spin—rotation coupling is added. The possibility of determining the diagonal elements in the above tensors by high‐resolution microwave spectroscopy is discussed. Appropriate first‐order expressions are given for a general asymmetric‐top molecule.